it is a good idea to split it in three parts. i have no idea to check the size in O2, if you find that it is too big so resize it.
don't make arrestor and catapult lha and lhd don't have.
the harrier take of verticaly(no ramp)
but if you want make some script why not the side and the rear lift, the phalanx turret (that i haven't done), some light for the night mission, add some rescue boat, the rear door and the big cargo bay for the marines landing ship,the air bay with the lift a lot of idea.
i have a question is it possible to put unit and car on the deck if yes i'll make the typical navy tractor.